. >>> we turn now out west where northern california and parts of oregon are bracing for impact tonight from a third round of heavy storms. many areas have been hard hit by flooding in recent days, and tonight one california county is preparing for what could be a disaster. nbc's miguel almaguer is in the mountain town of truckey, california, along the rising river. >> reporter: good evening. tonight this area is under a state of emergency. the truckee river runs for 121 miles between california and nevada and officials say it is not a question of if but when will this river flood? along the truckee river rising water and concern. tonight the marsico family is hoping to save their home of 50 years. a rock and dirt beam may help keep the water away but today this family is moving out. >> that's important. >> reporter: carolyn has seen her home, this area flood before. >> it's a helpless feeling. there is nothing else you can do. there is nothing. so you just do what you can. >> reporter: with river water that could rise seven and a half feet with tomorrow's oncoming storm, washoe county